<template>
  <div class="app">
    <h3>我是App组件（祖）,{{name}}--{{price}}</h3>
    <Child></Child>
    
  </div>
</template>

<script>
import { reactive, toRefs,provide} from 'vue'
  import Child from './components/Child.vue'
  
  export default {
    name:'App',
    components:{
      Child,
    },
    setup(){
      let car = reactive({
        name:'奔驰',
        price: '40w'
      })

      provide('car',car)    //给自己的后代组件传递数据

      return {
        car,
        ...toRefs(car)
      }
    }
  }
</script>

<style>
  .app {
    background-color: gray;
    padding: 10px;
  }
</style>